Brand new Walker Ultra 16362 catalytic converter

Hello, I have a brand new walker ultra 16362 catalytic converter for sale... Paid well over $500 for it and looking for $200 obo... Unfortunately my Nissan decided the engine was going to go so no need for it anymore.... It is compatible with a 2002-2003 Nissan Maxima or a 2002 Infiniti I35.... Please text me at 437696twelve17.... Thank you